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Question

Evaluate the mesh current $i_1$ in the given circuit:



 

 

The correct answer is
$i_1 = 1.132 \ A$

To evaluate the mesh current \(i_1\) in the given circuit, we will apply Kirchhoff's Voltage Law (KVL) to each mesh. The circuit consists of two meshes, and we will define the mesh currents as \(i_1\) for the left mesh and \(i_2\) for the right mesh.

Mesh 1 (Left Mesh):

  • Apply KVL: \(-5 + 4i_1 + 2(i_1 - i_2) + 2 = 0\)
  • Simplifying, we get: \(4i_1 + 2i_1 - 2i_2 - 3 = 0\)
  • This can be further simplified to: \(6i_1 - 2i_2 = 3\)   &;(Equation 1)

Mesh 2 (Right Mesh):

  • Apply KVL: \(-2 + 2(i_2 - i_1) + 5i_2 + 1 = 0\)
  • Simplifying, we get: \(2i_2 - 2i_1 + 5i_2 - 1 = 0\)
  • This can be further simplified to: \(7i_2 - 2i_1 = 1\)   &;(Equation 2)

Solve the Equations:

  • Equations are: \(6i_1 - 2i_2 = 3\) (Equation 1)
  • \(7i_2 - 2i_1 = 1\) (Equation 2)

Rearrange Equation 2: \(2i_1 = 7i_2 - 1 \Rightarrow i_1 = \frac{7i_2 - 1}{2}\)

  • Substitute \(i_1\) from Equation 2 into Equation 1: \(6\left(\frac{7i_2 - 1}{2}\right) - 2i_2 = 3\)
  • Simplify the equation: \(21i_2 - 3 - 2i_2 = 3\)
  • \(19i_2 = 6\)
  • Solving for \(i_2\): \(i_2 = \frac{6}{19}\)
  • Substitute back to find \(i_1\): \(i_1 = \frac{7\left(\frac{6}{19}\right) - 1}{2}\)
  • \(i_1 = \frac{42/19 - 1}{2} = \frac{23}{19}\)
  • Simplified, we get: \(i_1 \approx 1.132 \, A\)

Conclusion:

The correct option is \(i_1 = 1.132 \, A\).

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Important Questions from Mixed Topic (CUET PG)

  1. Who was the founder of Bolshevik Communist party?
  2. What is the key guide to statecraft in the realist tradition?
  3. Chronologically arrange the events in the Cold War period.
    A. Berlin Wall is constructed
    B. Communist China joins the UN
    C. Soviet invasion of Czechoslovakia
    D. Berlin Blockade
    Choose the correct answer from the options given below:
  4. Morgenthau's principles of political realism are:
    A. Politics is rooted in permanent and unchanging human nature which is basically self centred, self-regarding and self-interested
    B. Politics is an autonomous sphere of action and cannot therefore be reduced to morals
    C. International Politics is an arena of conflicting self-interests
    D. The ethics of international relations is situational ethics which is very different from private morality
    Choose the correct answer from the options given below:

  5. Who among the following political thinkers consider the anarchical self help system to be a compelling factor for States to maximise their relative power positions?

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